Nick is never late for work．He always gets to the office________．
A．on time B．in time C．at times
—Why was your class so lively，Mr．Li？
—Oh，my students________in groups about the coming school trip．
| A．discuss | B．are disclassing | C．were discussing | D．have discussed |
—The windows are broken and need to be repaired．
—I think so．They can hardly________the cold now．
| A．keep out | B．give out | C．take out | D．put out |
Most people are________building a paper factory near here．They are worried the river will get polluted．
| A．for | B．with | C．against | D．beyond |
If there________no buying and selling of animals，there will be no killing in nature．
| A．is | B．will be | C．has | D．will hav |